/* =============================================
   THE AI MASTERCLASS — BASE
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300&display=swap');

:root {
  --o:        #FF5500;
  --o-lt:     #FF7A40;
  --o-dim:    rgba(255,85,0,0.1);
  --o-glow:   rgba(255,85,0,0.4);
  --red:      #FF3333;
  --green:    #22C55E;
  --black:    #080808;
  --black-1:  #0C0C0C;
  --black-2:  #111111;
  --black-3:  #1A1A1A;
  --white:    #FFFFFF;
  --off-w:    #F6F6F4;
  --t:        #EDEDED;
  --t-2:      #777;
  --t-3:      #404040;
  --fh:       'Inter', sans-serif;
  --fb:       'DM Sans', sans-serif;
  --ease:     cubic-bezier(0.16, 1, 0.3, 1);
  --pill:     100px;
  --r:        10px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: auto; }

body {
  background: var(--black);
  color: var(--t);
  font-family: var(--fb);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: var(--fh);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.03em;
}
h1 { font-size: clamp(2.4rem, 5vw, 5rem); }
h2 { font-size: clamp(1.9rem, 3.5vw, 3.2rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.6rem); font-weight: 600; }
p  { font-size: clamp(0.95rem, 1.1vw, 1.05rem); line-height: 1.72; }

.container {
  width: 100%;
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 clamp(20px, 6vw, 72px);
}

/* ——— Buttons ——— */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--pill);
  font-family: var(--fh);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  white-space: nowrap;
  transition: all 0.22s var(--ease);
}
.btn-primary {
  background: var(--o);
  color: #fff;
  box-shadow: 0 4px 24px rgba(255,85,0,0.35);
}
.btn-primary:hover {
  background: var(--o-lt);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(255,85,0,0.5);
}
.btn-outline {
  background: transparent;
  color: var(--t);
  border: 1px solid rgba(237,237,237,0.15);
}
.btn-outline:hover { border-color: rgba(237,237,237,0.35); background: rgba(255,255,255,0.04); }
.btn-dark {
  background: #fff;
  color: #111;
  font-weight: 700;
}
.btn-dark:hover { background: var(--off-w); transform: translateY(-2px); }

/* ——— Price display ——— */
.price-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.p-old {
  font-family: var(--fh);
  font-size: 1rem;
  font-weight: 600;
  color: var(--red);
  text-decoration: line-through;
  opacity: 0.75;
}
.p-new {
  font-family: var(--fh);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--green);
  letter-spacing: -0.03em;
}
.p-note {
  font-family: var(--fh);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--o);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 5px;
}
.p-note::before {
  content: '';
  display: inline-block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--o);
  animation: blink 1.6s ease infinite;
}
@keyframes blink {
  0%,100%{ opacity:1 }
  50%{ opacity:0.2 }
}

/* ——— Section alternation ——— */
.s-black { background: var(--black); }
.s-black-1 { background: var(--black-1); }
.s-white { background: var(--white); color: #111; }
.s-white h2, .s-white h3 { color: #111; }
.s-white p { color: rgba(17,17,17,0.65); }

/* ——— Scroll reveal ——— */
[data-r] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
[data-r].on { opacity: 1; transform: none; }

/* ——— Scrollbar ——— */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--black); }
::-webkit-scrollbar-thumb { background: rgba(255,85,0,0.25); border-radius: 2px; }

/* ——— Pulse animation ——— */
@keyframes pulse-o {
  0%,100% { opacity:1; transform:scale(1); }
  50%      { opacity:0.3; transform:scale(0.6); }
}

/* ——— Logo AI gradient + glow ——— */
.logo-ai {
  display: inline-block;
  background: linear-gradient(135deg, #FF5500 0%, #FF8040 45%, #FF5500 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: ai-glow 2.5s ease-in-out infinite;
}
@keyframes ai-glow {
  0%,100% { filter: drop-shadow(0 0 3px rgba(255,85,0,0.5)); }
  50%      { filter: drop-shadow(0 0 9px rgba(255,85,0,0.9)) drop-shadow(0 0 20px rgba(255,85,0,0.35)); }
}

/* ——— Orange glow utility ——— */
.o-glow {
  display: inline-block;
  background: linear-gradient(135deg, #FF5500 0%, #FF8040 45%, #FF5500 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: ai-glow 2.5s ease-in-out infinite;
}